Detachable automobile-tire tread



L. T. SI NTZEL. qencmapuuromosus TIREIREAD.

Amlcniou FILED ocr. 4. 191a.

1,31 1,720, Patented July 29, 1919.

'INVENTOR.

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- ATTORNEYS U ITED STATES "PATENT OFFICE.

LEONARD T. SINTZEL', 0F L08 ANGIE-LE3, CALIFORNIL] nnmcmnnn AUTOMOBHJE-TEE To all whom z't may concern:

- Be it known that I, LEONARD T. S1 \"rznL, a citizen .of the United States, res1d1ng at Los Angeles, in the county of Los- Angeles 5 and State of California, have invented new and useful Improvements in Detachable Automobile-Tire Treads, of which the following is a specification.

My invention relates to an inflatable tire casing and more particularly to a tire casin provided with a removable and renew ab e tire -tread.

An object of my invention is to provide a casing for pneumatic tires and the like hav-. ing a removable tread portion which may easily be removed from t e tire and replaced by a new one. Another object is to provide a tire having a special protection against punctures.

{With these and other objects in view my invention consists in the construction and combination of parts as hereinafter shown, described and claimed.

. In'ithe accompanying drawings,

Figure 1 is a transverse section through the tire showing the position of the inner tube and the construction of the casing, together with the removable tread.

': Fig. 2 is a reduced view, in side elevation, of the tire with a part of one of the retain- ;ing beads broken away showing the meeting line between the removable tread and the tire casing.

. Referring to the several figures more par- 2"'o-f the usual form having reinforced rim heads 3 and 4, which extend around its inner circumference. A canvas covering 5 is cemente around the sides and over the tread 1 cm bead 3 to bead 4. Two thick nomelastic cords 6 and 7 are fixed to this canvas covering around the tire on each "side of the middle line of the tread parallel thereto and equally distant therefrom. A second covering 8 of canvas is cemented over tliefirst and over the parallel, cores 5 and 6. A'tltird reinforcing covering 9 of canvas is cemented to the second over the tread portion and the parallel cores part way down the sides of the casing. A layer of rubber- 10 is then spread over the reinforcing layer of canvas. This construction produces two parallel beads 11 and 12 running longitudinally around the tire with a tread groove 13 ticularly 1 is an inner tube within a casing Specification of Letters Patcnt. Patented uly 1919. Application iiled October 4, 1818. Serial No. 258,521.

between-them in which theremovable tread 14 normally is seated. The removable tread is preferably formed of a middlecable'15 wrapping. A relatively thick section 20 is laid on the outer part of the ring and a relatively thin covering around the sides 21 and 22 and inner part 23 of the ring. It is evident that a removable tire thus. formed will be fairly flexible and at the same time non-stretchable as to its circumference and would be firmly heldin its groove by the beads 11 and 12.

The 0 eration ofvmounting or removing the tread is simply to deflate the inner tube and collapse the casing by force sufiiciently to permit the mounting or removal of the tread.

While I have shown the preferred con struction of my tire casing and removable I tread as now known to me, it, will be under stood that various changes in construction and arrangement of parts may be madeby' thoseskilled in the art without departing from the spirit of my invention as claimed.

I claim:

1. In a. pneumatic tire casin a removable tread comprising, a middle cabIe of wire, two side cables one on eacl. side of the middle cable, canvas wra ped around the cables, and a covering 0 rubber applied to the canvas.

2. In a pneumatic tire casin a removable tread comprising, a middle ca 1e of twisted wire running aroundthe middle line of the tread, two similar side cables parallel to the middle cable and equally distant therefrom, two thicknesses of canvas wrapped around the cables, and a heavy covering of rubber applied to the canvas and vulcanized,- thg rubber-being relatively thick at the outer s1 e.

In testimony whereof I have signed my name to this specification.

LEONARD T. SINTZEL. 

